3 sentences

1. 别管闲事，做好你自己的工作。

   bié guǎn xián​shì, zuò hǎo nǐ zì​jǐ de gōng​zuò.

   Don't poke your nose into other people's business; just do your own work.

   Source: Dong Chinese Dictionary

2. 你少管闲事。

   nǐ shǎo guǎn xián​shì.

   Mind your own business.

   Source: Dong Chinese Dictionary

3. 我知道你不是一个爱管闲事的人。

   wǒ zhī​dào nǐ bù shì yī gè ài guǎn xián​shì de rén.

   I know you're not a busybody.

   Source: OpenSubtitles